Improvement in fire-proof mansard roofs



W. J. FRYER lr., 8L G. H. JHNSDN.

Fire-Proof Mansard Roofs.

N0. 141,25, Patentedjuly29,873.

UNITED STATES PATENT EEICE.

WILLIAM J. FRYER, JR., AND GEORGE H. JOHNSON, OF NEW YORK, N. Y.; SAIDJOHNSON ASSIGNOR TO SAID FRYER.

IMPROVEMENT IN FIRE-PROOF MANSARD RQOFS.

Specification forming part of Letters Patent No. 14 1,215. dated July29, 1873; applicati@ ld May 14, 1873.

To all whom t may concern:

Be it known that we, WILLIAM J. FRYER, Jr., and GEORGE H. JOHNSON, bothof New York, in the county of New York and State of New York, haveinvented a new and Improved Fire-Proof Mansard Roof; and we do herebydeclare the following to be a full, clear', and exact description of thesame, reference being had to the accompanying drawings making a part ofthis specitication, in which-- Figure l represents an elevation of aMansard` roof 5 Fig. 2, a vertical section 5 and Fig. 3, a transversesect-ion of the same.

Our invention rela-tes to the construction of Mansard roofs tire-proof.

\V e will describe all that is necessary to a full understanding of ourinvention, and then clearly point it out in the claims. f

A is a continuous metal bed-plate laid on top of the front brick wall. Bis a metallic beam placed at the'top line of the roof. C O C are uprightmetal rafters bolted to the plate at bottom and to the beam at top 5 thewhole thus forming a rigid metallic framework. D are hollow baked claytiles. E are ordinary slates, or imitation slates, placed on the outsideot' the tiles, and fastened thereto through the joints of the tiles. Thebaked-clay tiles are so formed on the ends f as to clasp the metallicupright rafters. The tiles are scored or roughened on the back toreceive plaster iinish. The slates on the outside are more to give theusual finished appearance than as an additional precaution against iireother than the tiles afford.

The outside ofthe tiles may be coated with Portland cement or othercomposition to give it a smooth or ornamental appearance.

An inside'ventilation through the tiles can be securedby leaving holesin the lower and upper row.

By combining the metallic frame-work and hollow baked-clay tile-fillingand outside covering of slates we secure, `first, anentrely tireproot'Mansard roof 5 second, one which is watertight and damp-proof, theair-'chamber rendering it cool in summer and warm in winter; third, avery light roof, and one which can be built up on any angle or curve.

On reference to the drawings it is apparent that the clasp of the tilesto the raking rafters secures to the tiles the lateral support necessaryto form the angular or curved baked-clay Mansard roof. Vhen the tilesand rafters are in position they act as abutments the rafters to thetiles-transversely. The

same form and principle of an arch can be Y formed of solid instead ofhollow materials, keeping to the same external outlines.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is-

1. A fire-proof Mansard roof formed of a

